Telmisartan

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Telmisartan
220px
Systematic (IUPAC) name
2-(4-{[4-Methyl-6-(1-methyl-1H-1,3-benzodiazol-2-yl)-2-propyl-1H-1,3-benzodiazol-1-yl]methyl}phenyl)benzoic acid
Clinical data
Trade names Micardis
AHFS/Drugs.com monograph
MedlinePlus a601249
Pregnancy
category
  • AU: D
  • US: D (Evidence of risk)
Legal status
  • AU: S4 (Prescription only)
  • UK: POM (Prescription only)
  • US: ℞-only
Routes of
administration		 Oral
Pharmacokinetic data
Bioavailability 42–100%
Protein binding ≥99.5%
Metabolism Minimal hepatic
Biological half-life 24 hours
Excretion Faecal 97%
Identifiers
CAS Number 144701-48-4 YesY
ATC code C09CA07 (WHO)
PubChem CID: 65999
IUPHAR/BPS 592
DrugBank DB00966 YesY
ChemSpider 59391 YesY
UNII U5SYW473RQ YesY
KEGG D00627 YesY
ChEBI CHEBI:9434 YesY
ChEMBL CHEMBL1017 YesY
Chemical data
Formula C33H30N4O2
Molecular mass 514.617 g/mol
  • O=C(O)c1ccccc1c2ccc(cc2)Cn3c4cc(cc(c4nc3CCC)C)c5nc6ccccc6n5C
  • InChI=1S/C33H30N4O2/c1-4-9-30-35-31-21(2)18-24(32-34-27-12-7-8-13-28(27)36(32)3)19-29(31)37(30)20-22-14-16-23(17-15-22)25-10-5-6-11-26(25)33(38)39/h5-8,10-19H,4,9,20H2,1-3H3,(H,38,39) YesY
  • Key:RMMXLENWKUUMAY-UHFFFAOYSA-N YesY
  (verify)

Telmisartan (INN) /tɛlmɪˈsɑːrtən/ is an angiotensin II receptor antagonist (angiotensin receptor blocker, ARB) used in the management of hypertension. It was discovered by Boehringer Ingelheim and launched in 1999 as Micardis.[1]

Indication

Telmisartan is indicated in the treatment of essential hypertension.[2][3]

Administration

The usually effective dose telmisartan is 40–80 mg once daily. Some patients may already benefit at a daily dose of 20 mg. In cases where the target blood pressure is not achieved, telmisartan dose can be increased to a maximum of 80 mg once daily.[2]

Contraindications

Telmisartan is contraindicated during pregnancy. Like other drugs affecting the renin-angiotensin system (RAS), telmisartan can cause birth defects, stillbirths, and neonatal deaths. It is not known whether the drug passes into the breast milk.[4] Also it is contraindicated in bilateral renal artery stenosis in which it can cause renal failure.

Side effects

Side effects are similar to other angiotensin II receptor antagonists and include tachycardia and bradycardia (fast or slow heartbeat), hypotension (low blood pressure), edema (swelling of arms, legs, lips, tongue, or throat, the latter leading to breathing problems), and allergic reactions.[4]

Mode of action

Telmisartan is an angiotensin II receptor blocker that shows high affinity for the angiotensin II receptor type 1 (AT1), with a binding affinity 3000 times greater for AT1 than AT2. It has the longest half-life of any ARB (24 hours)[2][5] and the largest volume of distribution among ARBs (500 liters).[6][7]

In addition to blocking the RAs, telmisartan acts as a selective modulator of peroxisome proliferator-activated receptor gamma (PPAR-γ), a central regulator of insulin and glucose metabolism. It is believed that telmisartan’s dual mode of action may provide protective benefits against the vascular and renal damage caused by diabetes and cardiovascular disease (CVD).[5]

Telmisartan's activity at the peroxisome proliferator-activated receptor delta (PPAR-δ) receptor has prompted speculation around its potential as a sport doping agent as an alternative to GW 501516.[8] Telmisartan activates PPAR-δ receptors in several tissues.[9][10][11][12]

Clinical trials

ONTARGET

The Ongoing Telmisartan Alone and in combination with Ramipril Global Endpoint Trial (ONTARGET) was one of the largest ARB clinical studies ever undertaken;[13] 25,620 patients from 733 centres in 41 countries were randomised for 5.5 years of treatment of either telmisartan, the ACE inhibitor ramipril or a combination of the two. The study aimed to investigate the role of telmisartan in cardiovascular (CV) protection through the primary composite outcome of death from CV causes, myocardial infarction, stroke or hospilization for heart failure, in high CV risk patients.

The study showed telmisartan was as effective as ramipril but with lower rates of cough and angioedema, which led to fewer discontinuations. The combination group experienced similar efficacy, but with increased risk of hypotensive symptoms. Moreover, in a patient population selected to tolerate ACE inhibitors, telmisartan was shown to be better tolerated and associated with higher treatment compliance than ramipril.[14]

TRANSCEND

As part of the ONTARGET study, patients who could not tolerate ACE inhibitors were randomly assigned to receive either telmisartan or placebo as part of the Telmisartan Randomized Assessment Study in ACE Intolerant Subjects with Cardiovascular Disease (TRANSCEND) study. An accompanying editorial comments: "Overall, data supporting use of angiotensin-receptor blockers to prevent vascular events in various cardiovascular groups, other than heart failure, are incomplete. TRANSCEND's results challenge the non-inferiority shown in ONTARGET and suggest no more than a modest effect, if any at all."[15]

PRoFESS

The Prevention Regimen For Effectively Avoiding Second Strokes (PRoFESS) study investigated therapy with telmisartan initiated soon after an ischemic stroke and continued for 2.5 years. This treatment did not significantly lower the rate of recurrent stroke, major cardiovascular events, or diabetes.[16]

See also

References

  1. ↑ http://www.boehringer-ingelheim.com/corporate_profile/history/history3.html
  2. ↑ 2.0 2.1 2.2 Pritor prescribing information
  3. ↑ Drugs.com: Telmisartan
  4. ↑ 4.0 4.1 Drugs.com: Micardis
  5. ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  10. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  12. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  13. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  14. ↑ Bayer Healthcare: Telmisartan approved by the European Commission to reduce the risk of cardiovascular (CV) morbidity in a broad spectrum of at risk patients
  15. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  16. ↑ Clinical trial number NCT00153062 for "PRoFESS - Prevention Regimen For Effectively Avoiding Second Strokes" at ClinicalTrials.gov
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